Shaft bearing for mounting a spinning rotor of a rotor spinning machine

Abstract

The invention relates to a shaft bearing for mounting a spinning rotor of a rotor spinning machine, with a double-row rolling bearing, which comprises two rolling-body rows that roll on their inner side without an inner ring, on two inner bearing races arranged at a distance from one another on a rotor shaft, and on their outer side on outer bearing races of two separate outer rings. According to the invention, the outer rings are mounted resiliently in a shaft bearing housing so as to provide a shaft bearing for mounting a spinning rotor of a rotor spinning machine with high reliability, even at rotational speeds of more than 110,000 revolutions per minute, which shaft bearing also allows trouble-free operation of a rotor spinning machine equipped with the shaft bearing.

1 . A shaft bearing ( 1 ) for mounting a spinning rotor of a rotor spinning machine, comprising a double-row rolling-element bearing having two rows ( 20   a,    20   b ) of rolling members, which,
 on the inside, roll, without any inner ring, on two inner raceways ( 4 ) spaced apart from one another on a shaft, in particular on a rotor shaft ( 2 ), and which,   on the outside, roll on outer raceways ( 6 ),   
       wherein on the outside, the rows ( 20   a,    20   b ) of rolling members roll on outer raceways ( 6 ) of two separate outer rings ( 5   a,    5   b ) that are spaced apart from one another in a longitudinal axis direction of the rotor shaft ( 2 ), and 
       the outer rings ( 5   a,    5   b ) are in turn borne in a shaft bearing housing ( 10 ) in a resiliently movable manner. 
     
     
         2 . The shaft bearing ( 1 ) according to  claim 1 , wherein the outer rings ( 5   a,    5   b ) are borne in the shaft bearing housing ( 10 ) by means of at least one bearing member ( 11   a,    11   b ) supported against the outer rings ( 5   a,    5   b ) and the shaft bearing housing ( 10 ), the at least one bearing member ( 11   a,    11   b ) either being formed from a resilient unit ( 14   a,    14   b ), at least in some portions, in the region between the outer rings ( 5   a,    5   b ) and the shaft bearing housing ( 10 ), or enclosing the resilient unit ( 14   a,    14   b ) at least in a radial or an axial direction of the rotor shaft ( 2 ). 
     
     
         3 . The shaft bearing ( 1 ) according to  claim 2 , wherein the bearing member ( 11   a,    11   b ) surrounds the resilient unit ( 14   a,    14   b ) at least in the radial or axial direction and is interlocked with the resilient unit ( 14   a,    14   b ) at least on one side in the enclosing direction. 
     
     
         4 . The shaft bearing ( 1 ) according to either  claim 1  or  claim 2 , wherein the bearing member ( 11   a ,  11   b ) is formed entirely from the resilient unit ( 14   a,    14   b ). 
     
     
         5 . The shaft bearing ( 1 ) according to either  claim 1  or  claim 2 , wherein the outer rings ( 5   a,    5   b ) are borne in the shaft bearing housing ( 10 ) by means of separate bearing members ( 11   a,    11   b ), which are preferably spaced apart from one another. 
     
     
         6 . The shaft bearing ( 1 ) according to either  claim 1  or  claim 2 , wherein a lubricant reservoir ( 15 ) is arranged in the region between the outer rings ( 5   a,    5   b ). 
     
     
         7 . The shaft bearing ( 1 ) according to  claim 6 , wherein lubricant reservoir ( 15 ) has a foam member configured for storing the lubricant, in particular lubricating oil. 
     
     
         8 . The shaft bearing ( 1 ) according to  claim 7 , wherein a reservoir support ( 17 ) which separates the lubricant reservoir ( 15 ), in particular the foam member, from the rotor shaft ( 2 ). 
     
     
         9 . The shaft bearing ( 1 ) according to  claim 8 , wherein the shaft bearing housing ( 10 ) has a closable lubricant filling opening ( 19 ) adjacent to the lubricant reservoir ( 15 ). 
     
     
         10 . The shaft bearing ( 1 ) according to  claim 1 , wherein the rolling-element bearing is configured as a ball bearing and the rows ( 20   a,    20   b ) of rolling members are configured as rows of balls. 
     
     
         11 . The shaft bearing ( 1 ) according to  claim 2 , wherein the resilient unit ( 14   a,    14   b ) is formed by a spring element made of a metal or non-metal material, by a damping element made of a plastics-containing material or by a fluid damping unit.